3 ways to tell if you have a cold or allergies

In the fall the culprit is ragweed, according to the American College of Allergy, Asthma & Immunology. The weeds grow in most regions, typically blooming and producing a fine-powder pollen from August into November, reaching peak levels in September.

When you are miserable with a runny nose, distinguishing between a cold and allergy can be confusing.